| Fort William to Olympia Heights (Florida) | 4,196.00 mi (6,752.82 km) |
| Fort William to Omaha (Nebraska) | 3,935.78 mi (6,334.02 km) |
| Fort William to On Top of the World Designated Place (Florida) | 4,084.98 mi (6,574.14 km) |
| Fort William to Onalaska (Wisconsin) | 3,636.02 mi (5,851.61 km) |
| Fort William to Oneida (New York) | 3,122.73 mi (5,025.54 km) |
| Fort William to Oneonta (New York) | 3,130.39 mi (5,037.88 km) |
| Fort William to Ontario (California) | 5,033.18 mi (8,100.12 km) |
| Fort William to Ontario (Oregon) | 4,436.44 mi (7,139.76 km) |
| Fort William to Opa-locka (Florida) | 4,183.20 mi (6,732.20 km) |
| Fort William to Opelika (Alabama) | 4,009.22 mi (6,452.21 km) |
| Fort William to Opelousas (Louisiana) | 4,370.72 mi (7,034.00 km) |
| Fort William to Orange (California) | 5,053.52 mi (8,132.86 km) |
| Fort William to Orange (Texas) | 4,453.79 mi (7,167.68 km) |
| Fort William to Orange City (Florida) | 4,056.72 mi (6,528.65 km) |
| Fort William to Orangeburg (South Carolina) | 3,797.55 mi (6,111.56 km) |
